V4L/DVB (8998): s2api: restore DTV_UNDEFINED

Signed-off-by: NSteven Toth <stoth@linuxtv.org>
Signed-off-by: NMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

include/linux/dvb/frontend.h

@@ -251,6 +251,7 @@ struct dvb_frontend_event {
  * binary compatability.
  */
 typedef enum dtv_cmd_types {
+	DTV_UNDEFINED,
 	DTV_TUNE,
 	DTV_CLEAR,